World War I: a poisonous gas attack on the Canadians in Flanders, 24 April 1915. Coloured chalks by Louis Raemaekers. ca. 1918.

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Credit: World War I: a poisonous gas attack on the Canadians in Flanders, 24 April 1915. Coloured chalks by Louis Raemaekers. ca. 1918. Credit: Wellcome Collection. Attribution 4.0 International (CC BY 4.0)